A researcher has already written a study proposal and performed a power analysis, which indicates that the sample size will have to be at least 36 if a type II error is to be avoided
The researcher then decides to set the level of significance at p <.01 rather than p <.05 but wants to maintain power at 0.8. What will the researcher have to do in order to maintain sufficient power?
a. Increase the effect size.
b. Set beta at 0.60.
c. Use a different statistical test.
d. Increase the sample size.
ANS: D
You determine the sample size needed to obtain sufficient power by performing a power analysis. Power analysis includes the standard power (usually 80%), level of significance (usually set at 0.05 in nursing studies), effect size, and sample size. In order to demonstrate statistical significance at a more stringent level (a decreased alpha), the sample size must be increased. The effect size is determined by the magnitude of effect that the intervention produces and, consequently, cannot be adjusted.
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